Colorless is artifice, machinery, weapons, and equipment
Power is what a creature uses to attack with, and toughness is what a creature defends with
Of the three, it is the most legitimate "split" card
Two sorta implies youre expecting every game to end early, since even if you can use the discard-draw mode in a pinch you really dont want to, and already I expect a lot of Lesson packages to be two copies of the generic one you want to find and one flex slot
However, weirdly enough, its also sometimes the best card against soft graveyard hate like Relic of Progenitus and Soul-Guide Lantern, as you can quickly rebuild a graveyard to fuel a Murktide Regent if your opponent has exiled your graveyard earlier in the game